Stadium: Court 1 Round: 25 Ground: Carpet indoor
| ITF Czech Republic F9 | 2018/11/05 12:20 | Terczynski, Mateusz v Vondrak, Martin | 4-6,3-6 |
| ITF Czech Republic F9 | 2018/11/04 10:00 | Vondrak, Martin v Michal Lusovsky | 6-7,6-4,7-6 |
| Challenger Prostejov Qual | 2018/06/03 14:15 | Cuevas, Martin v Vondrak, Martin | 7-5,6-1 |
| Challenger Prostejov Qual | 2018/06/03 08:00 | Jakub Novak v Vondrak, Martin | 2-6,0-6 |
| ITF Germany F16 | 2018/10/23 13:10 | Guenther, Valentin v Tyurnev, Evgeny | 2-6,2-6 |
| ITF Germany F14 | 2018/10/04 10:00 | Christoph Negritu v Guenther, Valentin | 3-6,7-5,7-5 |
| ITF Germany F14 | 2018/10/03 11:35 | Aichhorn, Jakob v Guenther, Valentin | 3-6,2-6 |
| ITF Belgium F10 | 2018/08/28 08:00 | Guenther, Valentin v Mariano Kestelboim | 3-6,1-6 |
| ITF Germany F13 | 2018/08/21 08:00 | Kai Wehnelt v Guenther, Valentin | 7-5,6-1 |
| ITF Netherlands F3 | 2018/07/11 12:50 | Huertas Del Pino Cordova, Arklon v Guenther, Valentin | 3-6,6-3,7-5 |
| ITF Netherlands F3 | 2018/07/10 12:00 | Yanais Laurent v Guenther, Valentin | 3-6,3-6 |
| ITF Netherlands F3 | 2018/07/07 09:30 | Guenther, Valentin v Khlif, Noe | 4-6,6-2,6-4 |